Help with transformer for stereo tube preamp

Discussion in 'General Electronics Chat' started by FSTOP, Jan 30, 2009.

  1. FSTOP

    Thread Starter New Member

    Jan 26, 2009
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    Can someone help me find the correct power transformer for a stereo tube pre-amp kit? The specs say: AC 180V-0-180V 2*AC 6V 30W
    Attaching a photo of schematic as well.
    Any information or advice will be appreciated. I don't know anything about power transformers, so i'd appreciate any advice everyone can give me!
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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  3. FSTOP

    Thread Starter New Member

    Jan 26, 2009
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  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Yes, the transformer you found should work fine.

    For the other 6.3v transformer, practically any 120v to 6.3v transformer will work, but get one with a fairly low current output - you won't need much.

    Mouser or Digikey should have what you need in stock.
     
  5. FSTOP

    Thread Starter New Member

    Jan 26, 2009
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  6. Andrew Leigh

    Well-Known Member

    Sep 8, 2008
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    Hi,

    Hoffmanamps.com

    Specialise in tube stuff

    Andrew
     
  7. FSTOP

    Thread Starter New Member

    Jan 26, 2009
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  8. mikeska

    New Member

    Feb 18, 2009
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    The easiest way to get Vacuum tube stuff is to buy broken equipment from ebay and pawn shops. Very likely, most of the electrolytic capacitors are going to be dead, but you can acquire lots of useful high power parts, sockets, transformers, etc... Worth giving a shot if you can't find something in the right price range.

    Another alternative which you can try, is to build a little switching power supply to jack up the voltage to a couple hundred (I've used this to power a bunch of "Nixie" tubes for a photo darkroom timer ).
    If you need an output transformer for a power amp. though, you;ll need to go the pawn shop/ebay way, since most new trafs are too expensive imho.

    And the 6v transformer you can probably get from Radio Shack, for the heater.
    You can find exactly the specs the Vacuum tubes will require on their datasheets.

    ~mikeska
     
    Last edited: Feb 21, 2009
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